CN109591324A - The forming method of carbon fiber product - Google Patents
The forming method of carbon fiber product Download PDFInfo
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- CN109591324A CN109591324A CN201710914371.4A CN201710914371A CN109591324A CN 109591324 A CN109591324 A CN 109591324A CN 201710914371 A CN201710914371 A CN 201710914371A CN 109591324 A CN109591324 A CN 109591324A
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- mold
- carbon fiber
- lower template
- confined space
- gas
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
- B29C70/443—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding and impregnating by vacuum or injection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
Abstract
The present invention relates to carbon fiber forming fields, disclose a kind of forming method of carbon fiber product, wherein, this method carries out in hydraulic press, and hydraulic press includes cope plate, lower template and mold, and confined space is formed between cope plate and lower template, mold is arranged in confined space and is located in lower template, cope plate is provided with gas pressurized mouth, and lower template and mold, which are provided with, vacuumizes interface, and lower template vacuumize interface and mold vacuumize orifice；The method includes the carbon fiber for passing through pre-preg is placed in mold, and spread vacuum bag, mold is vacuumized by vacuumizing interface and mold is heated, gas is then filled with to the confined space by gas pressurized mouth, and mold is made to continue to keep vacuum state.The carbon fiber product better quality of the forming method preparation of the application, cost are lower.
Description
Technical field
The present invention relates to carbon fiber forming fields, and in particular to a kind of forming method of carbon fiber product.
Background technique
Carbon fiber weight ratio aluminium is light, and intensity is but higher than steel, and has the advantages that corrosion-resistant, high temperature resistant, modulus are high, referred to as
" king of brand-new material ".Mature moulding process mainly has four kinds of molding works such as SMC, RTM, vacuum bag pressure and autoclave at present
Skill.Wherein, most product all uses autoclave process.Different carbon fiber products when using autoclave process, method with
Step is similar, be essentially all according to laying blank, vacuum bag processed, vacuum leak hunting, workpiece enter tank, open temperature program, pressurization,
Heat-insulation pressure keeping, cooling, decompression shut down, workpiece go out tank sequence carry out, the main distinction is the difference of mold and according to system
Performance needed for product and the technological parameter set.
The investment of autoclave molding method is big, at high cost, and autoclave integrates with, and complicated, cost is high, and investment is big.When using every time not only
Consume the energy such as water, electricity, gas, it is also necessary to which vacuum bag film, inhales the auxiliary materials such as gluing, isolation cloth at sealing joint strip, makes production cost
Increase by a relatively large margin.
CN201611250618.9 discloses a kind of high pressure temperature equalization system for being used to prepare carbon fiber part, and it is multiple to belong to carbon fiber
Condensation material manufacturing technology field.The system includes hot blast heater, the vacuum pump being arranged in outside hot blast heater, is arranged in air blast
Metal autoclave in heating furnace, the air compressor for being arranged in outside hot blast heater and being connected with metal autoclave；It is described
Metal autoclave set gradually vacuum bag, breathing cloth, isolation film and mold from outside to inside, vacuum nozzle is set on vacuum bag, very
Empty mouth is controlled to a vacuum pump.High pressure temperature equalization system of the invention provides system by using metal autoclave and air compressor and needs
The air pressure wanted is realized without using autoclave bulky, at high cost and carries out carbon fibre material under high temperature and high pressure environment
Molding；High pressure temperature equalization system through the invention can have low cost to carbon fiber product flexibility batch micro operations, and flexibility is high
Feature.
CN201010562570.1 discloses a kind of thermoforming method of co-woven continuous fiber reinforced thermoplastic structural plate,
First on braider by prepreg shuffling be sheet or band-like prepreg tape；Prepreg tape is laid on mold and with vacuum bag or
Sealable polyester film；Then it heats up, vacuumizes, keep negative pressure of vacuum, keep the temperature one when temperature reaches the fusing point of thermoplastic resin
Pressure maintaining cooling molding after the section time；Vacuum bag or polyester film are finally removed, structural panel is obtained.It is produced with this shuffling method
Structural panel can drive away the air of interlayer in prepreg, and pressure is uniformly transferred by fiber, avoids and send out in machine direction
Raw offset, can also further strengthen on the basis of original fiber reinforcement, cost is greatly saved.
Summary of the invention
The purpose of the invention is to overcome the above problem of the existing technology, a kind of molding of carbon fiber product is provided
Method, the better quality of the carbon fiber product of this method preparation, cost are lower.
To achieve the goals above, the present invention provides a kind of forming methods of carbon fiber product, wherein this method is in liquid
It is carried out in press, the hydraulic press includes cope plate, lower template and mold, is formed between the cope plate and the lower template close
Space is closed, the mold is arranged in the confined space and is located in the lower template, and the cope plate is provided with gas and adds
Press mouth, the lower template and the mold be provided with and vacuumize interface, and the lower template vacuumizes interface and the mould
Tool vacuumizes orifice；
The described method includes: the carbon fiber Jing Guo pre-preg is placed in the mold, and vacuum bag is spread, it is true by taking out
Null interface vacuumizes mold and is heated to mold, is then filled with gas to the confined space by gas pressurized mouth
Body, and mold is made to continue to keep vacuum state.
Through the above technical solutions, the forming method using the application prepares carbon fiber product, have the advantage that
(1) complicated hot pressing jar structure and autoclave process are eliminated, using hydraulic press, and have can be with for the hydraulic press
The confined space of opening and closing facilitates pick-and-place product.
(2) for SMC technique, the upper mold of mold cavity is eliminated, only retains lower die, and can vacuumize.
(3) final product quality is more preferable, and cost is lower, high-efficient.
(4) for vacuum bag pressure technique, large-scale oven is eliminated, low energy consumption.
(5) gas pressure in the confined space that the cope plate of the hydraulic press and lower template are formed can be up to 1.6Mpa,
Final product quality is more stable.
Detailed description of the invention
Fig. 1 is the schematic diagram of the forming method of carbon fiber product；
Fig. 2 is the schematic diagram of molding die.
Description of symbols
1, master cylinder 2, cope plate 3, brother's woods column
4, sealing element 5, lower template 6, vacuum bag
7, carbon fiber 8, die ontology
Specific embodiment
Below in conjunction with attached drawing, detailed description of the preferred embodiments.It should be understood that this place is retouched
The specific embodiment stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
A kind of forming method of carbon fiber product is provided according to the present invention, wherein this method carries out in hydraulic press, institute
Stating hydraulic press includes cope plate, lower template and mold, and confined space, the mould are formed between the cope plate and the lower template
Tool is arranged in the confined space and is located in the lower template, and the cope plate is provided with gas pressurized mouth, the lower die
Plate and the mold, which are provided with, vacuumizes interface, and the lower template vacuumize interface and the mold vacuumize interface
Connection；
The described method includes: the carbon fiber Jing Guo pre-preg is placed in the mold, and vacuum bag is spread, it is true by taking out
Null interface vacuumizes mold and is heated to mold, is then filled with gas to the confined space by gas pressurized mouth
Body, and mold is made to continue to keep vacuum state.
According to the method for the present invention, after the die ontology to be carried out to vacuumize process, it is ensured that vacuum bag safely may be used
It leans on, it is then possible to be less than the gas of 1.6MPa to the confined space charged pressure by the gas pressurized mouth, preferably
The gas of 1.2-1.55MPa, the more preferably gas of 1.48-1.52MPa；At this point, the die ontology continues to keep vacuum shape
State, pressure maintaining allow the gas pressure (passing through vacuum bag) of confined space to be applied on carbon fiber, can make the carbon fiber product of preparation
Better quality, cost is lower.
According to the method for the present invention, the gas can be inert gas, for example, the inert gas can be for i.e.Helium
(He)、Neon(Ne)、Argon(Ar), krypton (Kr), xenon (Xe) and tool are radioactiveRadon(Rn), in the present invention, it is preferred to beArgonGas.
According to the method for the present invention, the carbon fiber can be for the carbon fiber sheet by pre-preg and/or by pre-preg
Carbon fiber felt, it is preferable that the carbon fiber can be in viscose glue base fiber, polyacrylonitrile-based carbon fibre and asphalt base carbon fiber
It is one or more.
According to the method for the present invention, sealing element can be set between the cope plate and the lower template, it is preferable that institute
State the sealing element that sealing element is self-sealing form.In the present invention, confined air is formed by cope plate, lower template and sealing element
Between.
According to the method for the present invention, the cope plate, lower template can be fixedly installed, and can also be arranged with on-fixed, not had
Specific to limit, for example, the lower template can be fixedly installed, the cope plate is set as liftable；Or it can will be described
Cope plate fixed setting, the lower template are set as liftable.In the present invention, it is preferred to the lower template is fixedly installed,
The cope plate is set as liftable.
Method in accordance with the invention it is preferred that while being vacuumized to mold, it can be to the cope plate and institute
It states the confined space formed between lower template and carries out vacuumize process.
According to the method for the present invention, slide unit can also be set in the lower template, can be laid with and (puts when slide unit skids off
Set) carbon fiber.
According to the method for the present invention, the molding die may include die ontology, vacuum bag and vacuum pump；Wherein, institute
State the mold cavity being formed on die ontology for placing the carbon fiber by pre-preg；In addition, the mold cavity has
With the binding face of the carbon fiber, binding face plays supporting role to the carbon fiber.In the present invention, specifically, the mould
Having ontology further includes matrix part and sidewall portion, and the sidewall portion is arranged in the outer edge of described matrix portion and upwardly extends, described
The mold cavity, mold cavity approximation "u"-shaped are limited between matrix part and the sidewall portion, material carbon fiber to be laminated is put
After entering the mold cavity, it can be bonded with the mold inner cavity surface.
Wherein, the vacuum bag can be set on the die ontology, and by using sealing structure by the vacuum
Bag and mold cavity sealing；Specifically, the upper surface of the sidewall portion of the vacuum bag and the mold cavity passes through sealing structure
It is tightly connected.In the present invention, for example, the sealing structure can be sealing strip, sealing structure can guarantee the vacuum bag and
The favorable sealing property in space formed between the mold cavity, so that the vacuum bag is applied to by external pressure, into
And apply effective pressure to the carbon fiber.That is, the vacuum bag, the carbon fiber and the mold cavity form one
The carbon fiber is arranged between the vacuum bag and the mold cavity in other words for a so-called " sandwich " structure.
Wherein, the vacuum pump can be connected with the vacuum bag and for vacuumizing the bag vacuum
During, vacuum bag applies a lasting pressure to material to be laminated such as carbon fiber, and can make carbon fiber surface
Whole uniform force can obtain densely institutional framework, and then obtain good mechanical property to keep carbon fiber more closely knit
Energy.Vacuum bag is arranged on die ontology and sealed mold chamber.
According to the method for the present invention, the mold cavity can be for only with the mold cavity of lower mold, the bottom of the mold cavity
Portion, which can be set, vacuumizes interface, and the interface that vacuumizes of the bottom of the mold cavity can be with the lower template of the hydraulic press
Vacuumize interface be connected.
According to the method for the present invention, the condition vacuumized to the vacuum bag can be 300Pa or less, it is preferable that
Vacuum degree is 100-300Pa.
According to the method for the present invention, the item confined space of the die ontology or the hydraulic press vacuumized
Part is not particularly limited.
According to the method for the present invention, this method can also include using before being filled with gas to the confined space
Electric heater unit heats the die ontology.In addition, in the present invention, the electric heater unit is not particularly limited,
For example, the electric heater unit can be heating sheet, the heating sheet is arranged on the binding face；The electric heater unit is also
It can be heating rod, the heating rod is built in the die ontology.It, should for traditional heat radiation heating method
The heating efficiency of vacuum bag compression mould is higher, heating effect is more preferable.
According to the method for the present invention, the electric heater unit can be set on the die ontology and for being placed in
The carbon fiber stated on die ontology is heated；Material to be laminated such as carbon fiber has the characteristic of hot setting, therefore,
By heating to carbon fiber, it can make that carbon fiber is more closely knit, mechanical property is more preferable.In the present invention, vacuum bag is to carbon
Fiber applies pressure, meanwhile, electric heater unit directly heats carbon fiber, and double effects act on carbon fiber, and effect is more preferable.
Wherein, the temperature measuring equipment can be used for measuring the heating temperature of the electric heater unit, to detect the heating temperature
Whether degree meets the heating process requirement of carbon fiber.
Wherein, the control device can be connected with the temperature measuring equipment and the electric heater unit respectively.Controller is real
When monitoring temperature measuring equipment measured by temperature, when the temperature is unsatisfactory for target temperature, controller control electric heater unit adjustment
Heating temperature so that heating temperature is met the requirements, and then accelerates the curing rate of material carbon fiber to be laminated.
According to the method for the present invention, the condition heated to the die ontology can be with are as follows: heating temperature be 150 to
200℃；Preferably, heating temperature is 150 DEG C.
According to the method for the present invention, the tonnage of the hydraulic press and work top are determined by the size of product.Wherein, for
Massive article can take side to place the mode of mold, can reduce the size in hydraulic press workbench face in this way.
In conjunction with attached Fig. 1 and 2, preferred a kind of embodiment of the forming method of carbon fiber product according to the present invention, wherein
Method includes the following steps:
(1) carbon fiber sheet Jing Guo pre-preg and/or the carbon fiber felt Jing Guo pre-preg flat 7 are layered on the die ontology
In 8 mold cavity, and vacuum bag 6 is set thereon；The bottom of the mold cavity is vacuumized into interface and the hydraulic press
The interface that vacuumizes of lower template 5 is connected, and carries out vacuumize process to vacuum bag, it is ensured that vacuum bag installation is reliable；
(2) hydraulic press cope plate 2 is declined, the confined space formed with lower template accommodates molding die get up, up and down
Sealing element 4 between template uses self-sealing form, it is ensured that closure, wherein and the cope plate 2 is connected on master cylinder 1, and
The cope plate declines along brother woods column 3, and then contacts with the lower template, forms confined space；
(3) vacuumize process is carried out to the molding die；Also, using electric heater unit to the die ontology into
Row heating；Preferably, vacuumize process is carried out to the confined space formed between the cope plate and the lower template；
(4) after mold to be formed and vacuum degree reach technique requirement, Xiang Suoshu confined space charged pressure is less than 1.6Mpa
Inert gas, molding die continue keep vacuum state；
(5) pressure maintaining allows the gas pressure of confined space to be applied on carbon fiber product by vacuum bag, obtains qualified system
Product；
(6) pressure release, hydraulic press are opened, and finished product is taken out.
Using the forming method of carbon fiber product of the invention, on the one hand, during the preparation process, can be opened using hydraulic press
The confined space closed facilitates taking-up product；The structure of autoclave complexity is eliminated, and eliminates large-scale oven, low energy consumption；Separately
On the one hand, mold cavity eliminates the upper mold of product, only retains lower die, and can vacuumize, and the gas that confined space provides
Pressure can be up to 1.6Mpa, and final product quality is more preferable, and final product quality is more stable, and cost is lower.
The present invention will be described in detail by way of examples below.
Embodiment 1
The present embodiment indicates that the forming method of carbon fiber product of the invention.
(1) carbon fiber sheet Jing Guo pre-preg is laid in the mold cavity of the die ontology, and setting is true thereon
Empty bag；The interface that vacuumizes of the bottom of the mold cavity is connected with the interface that vacuumizes of the lower template of the hydraulic press, and right
Vacuum bag carries out vacuumize process, it is ensured that vacuum bag installation is reliable；Wherein, the vacuum degree of vacuum bag is 300Pa；
(2) hydraulic press cope plate is declined, the confined space formed with lower template accommodates molding die get up, upper and lower mould
Sealing element between plate uses self-sealing form, it is ensured that closure；
(3) vacuumize process is carried out to the molding die；Also, using electric heater unit to the die ontology into
Row heating, wherein heating temperature is 180 DEG C；Also, to the confined space formed between the cope plate and the lower template into
Row vacuumize process；Wherein, the vacuum degree of the die ontology is 300Pa, and the vacuum degree of the confined space B is 300Pa；
(4) after mold to be formed and vacuum degree reach technique requirement, Xiang Suoshu confined space charged pressure is less than 1.6MPa
Inert gas, molding die continue keep vacuum state；
(5) pressure maintaining allows the gas pressure of confined space to be applied on carbon fiber product by vacuum bag, obtains qualified system
Product；
(6) pressure release, hydraulic press are opened, and finished product is taken out.
As a result the carbon fiber product S1 quality of finished product good prepared, it is at low cost.
Embodiment 2
The present embodiment indicates that the forming method of carbon fiber product of the invention.
Prepare carbon fiber product in the same manner as shown in Example 1, institute the difference is that, in step (4), to institute
State the inert gas that confined space charged pressure is 1.5MPa.
As a result the carbon fiber product S2 quality of finished product good prepared, it is at low cost.
Embodiment 3
The present embodiment indicates that the forming method of carbon fiber product of the invention.
Prepare carbon fiber product in the same manner as shown in Example 1, institute the difference is that, in step (4), to institute
State the inert gas that confined space charged pressure is 1.25MPa.
As a result the carbon fiber product S3 quality of finished product good prepared, it is at low cost.
Embodiment 4
The present embodiment indicates that the forming method of carbon fiber product of the invention.
Prepare carbon fiber product in the same manner as shown in Example 1, institute the difference is that, in step (4), to institute
State the inert gas that confined space charged pressure is 1.3MPa.
As a result the carbon fiber product S4 quality of finished product good prepared, it is at low cost.
Embodiment 5
The present embodiment indicates that the forming method of carbon fiber product of the invention.
Prepare carbon fiber product in the same manner as shown in Example 1, institute the difference is that, in step (3), do not have
Vacuumize process is carried out to the confined space formed between the cope plate and the lower template；
As a result the carbon fiber product S5 quality of finished product good prepared, it is at low cost.
Comparative example 1
Prepare carbon fiber product in the same manner as shown in Example 1, institute the difference is that, in comparative example only with
Molding die prepares carbon fiber product, that is, hydraulic press is not used, specifically, method includes the following steps:
(1) carbon fiber sheet Jing Guo pre-preg is laid in the mold cavity of the die ontology, and setting is true thereon
Empty bag；And vacuumize process is carried out to vacuum bag, it is ensured that vacuum bag installation is reliable；Wherein, the vacuum degree of vacuum bag is 300Pa；
(2) vacuumize process is carried out to the molding die；Also, the die ontology is carried out using electric heater unit
Heating, wherein heating temperature is 180 DEG C；Wherein, the vacuum degree of the die ontology is 300Pa；
(3) after mold to be formed and vacuum degree reach technique requirement, molding die continues to keep vacuum state；
(4) pressure maintaining allows vacuum bag to be applied on carbon fiber product, obtains product；
(5) finished product is taken out in pressure release.
As a result the carbon fiber product DS1 final product quality portion prepared is good, at high cost.
By the result of above embodiments and comparative example it can be seen that preparing carbon fiber system using the forming method of the application
Product have the advantage that are as follows: (a) uses hydraulic press, and the hydraulic press has the confined space that can be opened and closed, and facilitates pick-and-place product.
(b) upper mold of mold cavity is eliminated, only retains lower die, and can vacuumize, final product quality is more preferable, and cost is lower.(c) liquid
The gas pressure in confined space that the cope plate and lower template of press are formed can be up to 1.6MPa, and final product quality is more stable.
The preferred embodiment of the present invention has been described above in detail, and still, the present invention is not limited thereto.In skill of the invention
In art conception range, can with various simple variants of the technical solution of the present invention are made, including each technical characteristic with it is any its
Its suitable method is combined, and it should also be regarded as the disclosure of the present invention for these simple variants and combination, is belonged to
Protection scope of the present invention.
Claims (8)
1. a kind of forming method of carbon fiber product, which is characterized in that this method carries out in hydraulic press, and the hydraulic press includes
Cope plate, lower template and mold, form confined space between the cope plate and the lower template, the mold is arranged described
In confined space and it is located in the lower template, the cope plate is provided with gas pressurized mouth, the lower template and the mold
Be provided with and vacuumize interface, and the lower template vacuumize interface and the mold vacuumize orifice；
The described method includes: the carbon fiber Jing Guo pre-preg is placed in the mold, and vacuum bag is spread, is connect by vacuumizing
Mouth vacuumizes mold and is heated to mold, is then filled with gas to the confined space by gas pressurized mouth,
And mold is made to continue to keep vacuum state.
2. according to the method described in claim 1, wherein, the gas that the confined space of Xiang Suoshu is filled with is that pressure is less than 1.6MPa
Gas, the preferably gas of 1.2-1.55MPa, the more preferably gas of 1.48-1.52MPa.
3. according to the method described in claim 1, wherein, the carbon fiber by pre-preg is the carbon fiber by pre-preg
Piece and/or carbon fiber felt Jing Guo pre-preg；
Preferably, carbon fiber is one of viscous glue based fibre, polyacrylonitrile-based carbon fibre and asphalt base carbon fiber or a variety of.
4. method described in any one of -3 according to claim 1, wherein the lower template fixed setting, the cope plate
It is set as liftable；Or the cope plate fixed setting, the lower template are set as liftable.
5. method according to claim 1 or 2, wherein while being vacuumized to mold, to the confined space
Carry out vacuumize process.
6. method according to claim 1 or 4, wherein be provided with slide unit in the lower template, the slide unit is put when skidding off
Set carbon fiber.
7. method according to claim 1 or 5, wherein the vacuum degree after the mold vacuumizes is 300Pa or less.
8. method according to claim 1 or claim 7, wherein the temperature after the mold heating is 150-200 DEG C.
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| CN113021953A (en) * | 2021-03-10 | 2021-06-25 | 广州雷迅创新科技股份有限公司 | Carbon fiber shell forming method and mold |
| CN113021943A (en) * | 2021-03-10 | 2021-06-25 | 广州雷迅创新科技股份有限公司 | Composite material bent sheet forming method and die |
| CN114454514A (en) * | 2022-01-28 | 2022-05-10 | 株洲博雅科技股份有限公司 | Busbar hot-pressing process and hot-pressing equipment |
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| CN113021953A (en) * | 2021-03-10 | 2021-06-25 | 广州雷迅创新科技股份有限公司 | Carbon fiber shell forming method and mold |
| CN113021943A (en) * | 2021-03-10 | 2021-06-25 | 广州雷迅创新科技股份有限公司 | Composite material bent sheet forming method and die |
| CN114454514A (en) * | 2022-01-28 | 2022-05-10 | 株洲博雅科技股份有限公司 | Busbar hot-pressing process and hot-pressing equipment |
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